Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba901bf0f779106…

MALICIOUS

PDF

79.7 KB Created: 2021-03-28 16:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4b59f7434ce1e847fe06deae241f1210 SHA-1: b0c648377a2fbd05255f9ff663614e33ca25bbad SHA-256: 8ba901bf0f779106385f0c3637eba9ae9cd914231fe4ba34f5c59e5f75f19f0d
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://botokaw.ru/wix?keyword=clearwater+coast+guard+active+calls PDF link annotation
    • https://cdn.sqhk.co/vasibejovej/fuTQegg/reragatijotidelowakapos.pdfIn PDF document text
    • https://cdn.sqhk.co/nekuripafi/htvMgfg/maroon_colour_meaning_in_marathi.pdfIn PDF document text
    • https://cdn.sqhk.co/mibaforetu/MqRiajc/75342785940.pdfIn PDF document text
    • http://munasimowijuxi.getenjoyment.net/optex_vxi_am.pdfIn PDF document text
    • http://ziwigosopijulal.mygamesonline.org/vefawe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b868272-813f-4e1a-90d2-3402edb441a2/65563160483.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/789c8a74-e023-4326-be6d-e3eec20270e2/bonudat.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/leter.pdfIn PDF document text
    • http://xefejej.epizy.com/87083401239.pdfIn PDF document text
    • http://fezipowivi.rf.gd/aiou_online_admission_form_2019_continuing_student.pdfIn PDF document text
    • http://wowimes.epizy.com/buzolunel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db896072-c0b8-48d3-a8a1-ba4084427620/2007_chevy_impala_headlight_covers.pdfIn PDF document text
    • http://gajopule.myartsonline.com/how_old_to_start_playing_tennis.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/zesidegazeviwuna.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E6 5164 bytes
SHA-256: 29121c0eb58e6ed60b4c01f0dcad45492e62e20aaa558ae9bbda3430d28ab2cc
font_01_sfnt_off00010a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A99 11600 bytes
SHA-256: aa956afc774de2f42118553354745dd33d33e43b889332242719c42880bcc22c

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